cyano

Ok so I have been through a lot with my current tank and set up but I am starting to lose some very hardy corals and as well there are some things and corals I would like to rid my tank of (blue clove polyps, xenia.) My rock I bought "live" but it is not very porous and I think may be leaching some bad into my water as well. So I am thinking about "starting over" and wanted to get some input.

First off if i do this my equipment and tank would remain the same but ...